152 BLAXFORD : GEOLOGY OF WESTERN SIND. 



From Sunehri Dhandh to Jhimpir Railway Station is a distance of 



about 6 miles ; the rocks traversed are the upper- 

 Jhimpir. 



most strata of the Ranikot group and the lowest 



Khirthar beds, and consist of alternations of brown and yellow salt marls 



and Alveolina limestone. There is some rolling, but the general dip is 



westward. Near the station, white and grey Khirthar limestone, and 



yellow marls, with Nerita schmideliana, Jiur/iodia cakleri, Orbilolites, and 



other Foraminifera, make their appearance. 



A low scarp north-west of the railway, close to Jhimpir station, con- 

 sists of limestone in alternating beds, white or pale coloured, and 

 brownish, with an admixture of sand. A part of the rock is flinty and 

 cherty. There is a considerable thickness of these alternating beds, and 

 the soft saline yellow marls with Nerita, Orbitolites, &c, crop out from 

 beneath them and south-east of the railway. At the base of the scarp 

 there is a red mottled bed. 



On the plain to the west and north-west of Jhimpir only surface 

 gravels and calcareous tufa are to be seen, but 

 farther north some yellow and mottled argillace- 

 ous limestone is exposed. Then several low parallel ridges, caused by 

 small anticlinal folds of the strata, are met with, and on the eastern 

 side of the ridge, on which the Ghatana trigonometrical station stands, 

 there is a patch of brown gritty quartzose sandstone containing im- 

 perfect marine fossils, none of them, however, being specifically recogniz- 

 able. This rock might be Nari, but is more probably Gaj. The patch 

 is too small to be shown on the map. 



About 4 or 5 miles west of Jhimpir, and 1| miles west-north- 



Brown limestone west ™ si of a water hole called Bhookun on the 

 of Jhimpir. ^^ aU( j i_i nc h maps, there is a rather con- 



spicuous scarp of compact limestone about 15 feet thick, yellowish-buff 

 or brown in colour, and having much the appearance of a Nari bed. 

 It rests upon white Khirthar limestone, and contains Alveolina and 

 Palett'ina, so that it must be of Khirthar age. To the northward this 

 bed continues for a long distance, forming a nearly horizontal plateau, 

 ( 152 ) 



